The Galaxy S6 / Galaxy S6 edge support Adaptive Fast Charging (50% charge in 30 mins, 100% charge in 100 mins).
For fastest charging times, use the Adaptive Fast Charging charger that came with the device.
To turn on Fast charging, navigate: then tap the
Fast cable charging switch
to turn on

.
Ensure the cable is inserted correctly into the charging base for optimal performance.
Battery life depends on the network, signal strength, temperature, features and accessories used.
It's common for batteries to be warm from use or charging.
Use only manufacturer-approved chargers.